<!DOCTYPE html>
        <html>
            <meta charset="utf-8">
            <title>attack</title>
            <script>
                function execute(){
                    for(var obj in window){
                        alert(obj)
                        //if("getClass" in window[obj]){
                        //    return window[obj].getClass().forName("java.lang.Runtime")
                        //}
                    }
                }
            </script>
        </html>